package Linepinjie;

public class line2 {
    public static void main(String[] args) {
        int[] arr={1,2,3};
        String s=arrToString(arr);
        System.out.println(s);
    }
    public static String arrToString(int[] arr){
        StringBuilder sb=new StringBuilder();
        sb.append("[");
        for(int i=0;i<arr.length;i++){
            if(i==arr.length-1){
                sb.append(arr[i]);
            }else {
                sb.append((arr[i]+","));
            }
        }

        sb.append("]");
        String s=sb.toString();
        return s;
    }
}
